This film was originally to be released by RKO Radio Pictures, but by the time it was ready for release, that studio had closed down and the film was distributed by Warner Bros. It may be the only instance where the logos of both companies appear on the same film
The film was not actually shot in widescreen. It was converted to CinemaScope in the final print after having been shot in standard Academy ratio, much like some films which are "matted" after having been shot in Academy ratio. The process used was contemporary of Superscope and a forerunner of Super 35. It was filmed using spherical lenses at an aspect ratio of 1.37:1. In the printing process, the images were cropped to a height of 2 perforations giving them an aspect ratio of 2.36:1. The images were then stretched vertically to a height of 4 perforations, at which point they conformed to the standard CinemaScope-2 format.
The trivia item below may give away important plot points.
In the Norman Mailer novel, Lt. Hearn is killed when Sgt. Croft allows him to walk into the Japanese machine gun nest Martinez had discovered on his one-man night reconnaissance. Martinez had shared the knowledge of the machine gun nest only with Croft, who in turn kept it from Lt. Hearn and the other men.